Running instances with overpowered groups gets very old after awhile.

I have rule books for RPG systems I have never played, and probably never will. Every time I find a setting I like, can spend weeks exploring, reading, researching and talking about it.

Oh how I understand that!
I own several RPG-system-rulebooks that are only ebooks because the chance I’ll ever convince my gaming group of trying them is so small you’d need a particle accelerator to find proof of it’s existence.
Relating to WH40k: Have you had a look into it’s RPGs Rogue Trader and Dark Heresy?

@ Adrian:

Well, games like TES and KoTOR have very expansive settings that can be explored entirely within the game. Next to those WoW’s setting does fall a little bit flat, but…

Well, let me compare it to the Warhammer 40k games. If you have only played Dawn of War you got a mere glimpse at the expansive Warhammer universe – but there is so much more out there. That’s sort of how WoW is. There is only so much content that can be fitted into the MMO formula, but there is so much more out there. WoW is better at allowing you to explore the setting than an RTS game, but not as good at building the narrative as a full fledged RPG like KoTOR.

Does that make sense?

This is the same reason why Fallout, TES, Total War series and KoTOR always hold my attention for one to two months at a time. I just become enamored with the lore and intricacies of the setting..

I tried WoW once too, but found everything too simplistic and too much of a typical fantasy world. But I might have to give it another chance again.

Adrian